A: A blood moon is a deep reddening of the moon caused by the Earth passing between the moon and the sun. During the period of the eclipse, light from the sun... Full Answer >
Sometimes, bones are the only accessible source of DNA, thanks to their structure, which preserves DNA comparatively well and for a long time. The main problems of DNA extraction from bones are DNA degradation due to environmental factors and the presence of soil-derived inhibitors like humus acids [1â10].
Related: 400,000-Year-Old Human DNA Adds to Tangled Knowledge. The smash patterns on the mastodon bones and the stones left nearby look as if humans used the stones as tools to break apart bone to use for more tools, and perhaps to get at the nutritious bone marrow inside the large leg bones, the research team said.